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Archive of Scientific Highlights

  • The HIRDLS experiment is sensitive to the presence of small amounts of cirrus along limb-views in the upper troposphere. The thickness of cirrus clouds there influences the heating and cooling rates. Ongoing research using HIRDLS data will determine how this heating enhances vertical transport in the upper troposphere. More...
  • ACD scientists Julia Lee-Taylor and Sasha Madronich are using the GECKO-A model to investigate the formation of SOA from an explicit chemistry perspective. A typical simulation, starting with 60 precursor hydrocarbons, simulates ~5 million gas-phase reactions among ~1 million species. More...
  • ACD scientist Fred Eisele and postdoctoral fellow Jun Zhao recently developed a highly sensitive mass spectrometer, the Cluster CIMS, capable of measuring neutral molecular clusters in the atmosphere. This instrument allows for the quantification of clusters containing 2-4 sulfuric acid (H2SO4) molecules. More...
  • The MOPITT team has made significant advances in demonstrating multispectral retrievals of CO (carbon monoxide) with enhanced sensitivity to near-surface CO. The MOPITT instrument on EOS-Terra has been measuring CO since March 2000, and is the only satellite instrument with both thermal infrared and near infrared CO channels. More...
  • Satellite observations have revealed that cirrus is very prevalent near the tropopause throughout most of the tropics. The cirrus is of interest since it restricts the amount of water vapor that is transported from the upper troposphere into the lower stratosphere. More...
  • Increasing anthropogenic pollution and wildfires are the main producers of CO (carbon monoxide) pollution in the Northern Hemisphere. More...
  • The global chemical transport model MOZART-4 has been recently released to the scientific community through the ACD MOZART-4 homepage and the NCAR Community Data Portal. More...
  • NASA’s SABER instrument on the TIMED satellite measures temperature and ozone through the middle atmosphere from 20 to above 100 km. More...
  • The HIRDLS satellite reveals the structure of the Upper Troposphere / Lower Stratosphere (UTLS) region by measuring ozone. More...
  • Over the past four years, the POP group has made observations of OH, H2SO4, HO2, HO2+RO2 and OH reactivity at a number of sites around the globe. More...
  • The MOPITT satellite instrument has been routinely monitoring tropospheric concentrations of carbon monoxide (CO) since March 2000. MOPITT is equipped with gas correlation radiometers   More...
  • Temperature changes in the stratosphere are an important component of global change, and are closely linked to understanding the behavior of stratospheric ozone. More...
  • Chemical OSSE studies help to define quantitative measurement requirements for satellite missions. More...
  • NCAR's Model for Ozone and Related Chemical Tracers, version 4 (MOZART-4) has been used to quantify the ozone produced by emissions from the Mexico City metropolitan area. More...
  • NCAR's Whole Atmosphere Community Climate Model (WACCM) has been used to simulate climate change in the 21st century. More...
  • O3 Lamina observations are available with the HIRDLS V004 Ozone data product. More...
  • The Photochemical Oxidants and Products group makes use of chemical ionization mass spectrometry to quantify the concentrations of free radical species and some of the products of free radical reactions. More...
  • ACD scientists have been studying the reaction kinetics and mechanisms of HO2 radicals using a number of complementary techniques. More...
  • ACD and TIIMES scientists detected significant fluxes and concentrations of methyl salicylate (MeSA) in a tree plantation atmosphere More...
  • A recent study by scientists from ACD and the Méxican government concluded that México City’s ambient ozone (O3) can be reduced by decreasing emissions of volatile organic compounds (VOCs) More...
  • Thermal Desorption Chemical Ionization Mass Spectrometer (TDCIMS): What’s the composition of a tomato, and what does this have to do with atmospheric chemistry? More...
  • ACD Participates in TREX ACD participated in the Terrain-Induced Rotor Experiment (T-REX) with airborne measurements of O3, CO, and H2O More...
  • NCAR's Whole Atmosphere Community Climate Model (WACCM) is being used to study the atmospheric response from the surface to the lower thermosphere to changes in solar and geomagnetic forcing over the 11 year solar cycle. More...
  • Nitrogen Deposition to a Southeastern U.S. Forest: During the Duke Forest CELTIC study, we used the eddy covariance flux method to More...
  • ACD goes to MIRAGE
  • Tropospheric Ozone 1890 to 2100
  • hirdls_temp.shtml
  • Successful Implementation of a New Method of Analyzing Tropospheric Peroxy Radicals: Peroxy radicals play very important roles in the atmosphere. For example, when peroxy radicals react with nitric oxide More...